[1]f - Fader Module

Marsoni

M251S

$119.00

Get it in 3 business days with 1 day shipping. Friday, May 29

[1]f - Fader ModuleThe Instru [1]f is a crossfader, attenuator, attenuverter, and manual DC offset. Whether you want to crossfade between two audio signals, attenuate an envelope, invert a sawtooth LFO for ramped modulation, or use a DC offset to access the Mod parameters of your arbhar, [1]f is the perfect multi utility for all of your CV processing tasks.

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Just installed in a 2006 4Runner. Can’t speak to exact filter partials or longevity, but what I can’t say is that it fits very well and looks to be made very well. It actually fits better than the Bosh filters I normally use. Has a nice foam seal around all 4 edges and fits in the tray perfectly. Seem to be a nice option. So if you have a 03-09 4Runner it’s going to work well. Here’s some pictures of this filter (the blue one) next to a Bosh filter I removed. Also a picture with it in the factory tray.

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Reviewed in the United States on March 1, 2026